Giant Mutual Proximity Effects in Ferromagnetic/Superconducting Nanostructures
1999; American Physical Society; Volume: 83; Issue: 16 Linguagem: Inglês
10.1103/physrevlett.83.3281
ISSN1092-0145
AutoresV. T. Petrashov, I. A. Sosnin, I. Cox, A. Parsons, Cedric Troadec,
Tópico(s)Advanced Chemical Physics Studies
ResumoA strong mutual influence of superconductors (S) and ferromagnetic (F) conductors in hybrid $\mathrm{F}/\mathrm{S}$ ( $\mathrm{Ni}/\mathrm{Al}$) nanostructures is observed. The proximity-induced conductance on the F side, $\ensuremath{\Delta}G$, is 2 orders of magnitude larger than that predicted by theory. A crossover from positive to negative $\ensuremath{\Delta}G$ takes place upon an increase in the $\mathrm{F}/\mathrm{S}$ interface barrier resistance. Reentrance of the superconductors to the normal state reciprocated by changes on the F side has been found in low applied magnetic fields with new peaks in the differential resistance as an effect of the saturation magnetization. An analysis has been developed providing a base for a numerical description of the system.
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